Results 131 to 140 of about 9,430 (182)

Synthesis of the C38–C54 spiroketal segment of halichondrin B

Tetrahedron Letters, 2012
Abstract Stereoselective synthesis of the C38–C54 segment of a marine metabolite halichondrin B comprising KLM and N rings with a C44 spiroketal including 10 chiral centers is described. The salient features of the synthesis are Carreira’s addition, Sharpless asymmetric dihydroxylation and double alkylation of TosMIC strategy and double vinyl ...
J.S. Yadav, C. Nagendra Reddy, G. Sabitha   +2 more
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Thermal Stability of Carbinofullerenes C38, C62, and C64

Physics of the Solid State, 2020
The thermal stability of recently predicted carbinofullerenes C38, C62, and C64 was examined using the molecular dynamics method. Their decomposition channels and temperature dependences of the lifetime were characterized. The activation energies and frequency factors in the Arrhenius law were determined.
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Catalytic synthesis of high-density C20-C38 isoparaffins

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1962
1. A study was made of the catalytic dimerization of five oiefins, namely C10-C19 trisubstituted ethylene derivatives, and the products of the hydrogenation of these dinners were prepared. 2. In the course of the dimerization partial isomerization of the dimers occurred. 3.
A. P. Meshcheryakov, E. I. Erzyutova, Go Chun'-i   +2 more
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Tensile Behavior of Semi-Solid C38 LTT Steel

Solid State Phenomena, 2016
The high temperature range for steel semi-solid state makes the experiments particularly challenging. While the response under shear or compression loadings was studied, few results concerned the response under tensile loading. In this paper, an experimental protocol was determined to characterize the uniaxial tensile response of the so-called C38 LTT ...
Khalil Traidi, Véronique Favier, Philippe Lestriez, Karl Debray, Laurent Langlois, Nicolas Ranc, Michel Saby, Philippe Mangin   +7 more
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Origanum Elongatum as a Green Corrosion Inhibitor for C38 Steel in an Acidic Medium

Journal of Failure Analysis and Prevention, 2021
The extract of Origanum elongatum Emb. and Maire (OEE) was used as a corrosion inhibitor for C38 steel in 1N HCl medium, the inhibitory effect was studied by different techniques, weight loss and electrochemical measurements. Weight loss measurements indicate a maximum efficiency of 77.50% at a concentration of 1 g/L at 298 K.
Khalil Chefira, Rachid Nmila, Tariq Benabbouha, Moustapha Siniti, Halima Rchid, Hassan El Attari   +5 more
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Colicin V38 and Microcin C38 Produced by Escherichia coli Strain 38

Avian Diseases, 1997
Escherichia coli strain 38, an isolate from turkeys, has been previously shown to produce one or more broad-spectrum bacteriocins against other related enteric bacteria. Using a collection of E. coli strains that synthesized well-characterized colicins or microcins, along with a set of colicin/microcin-insensitive mutants, we were able to classify the ...
R W, Leavitt, C, Braithwaite, M M, Jensen   +2 more
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Reihe C38 2′C1′

1983
Die letzten und besten der australischen Dampfschnellzugloks waren die 30 „C38“- Pazifiks der New South Wales Government Railways, gebaut zwischen 1943 und 1949. Die Konstruktionsarbeiten begannen zwar schon vor dem Krieg, aber die meisten von ihnen konnten erst nach Kriegsende geliefert werden.
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Toward the Total Synthesis of the Brasilinolides: Construction of a Differentially Protected C20−C38 Segment

Organic Letters, 2009
An efficient, convergent synthesis of a differentially protected C20-C38 segment of the brasilinolides is described. Iterative 1,4-syn aldol additions and ketone reductions were employed to construct the two related stereotetrads, while a sequence of Horner-Wadsworth-Emmons (HWE) coupling, CBS reduction, and Sharpless AE installed the epoxy alcohol ...
Ian, Paterson, Paul M, Burton, Christopher J, Cordier, Michael P, Housden, Friedrich A, Mühlthau, Olivier, Loiseleur   +5 more
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Kinetic investigation of C38 steel corrosion in concentrated perchloric acid solutions

Materials Chemistry and Physics, 2010
The corrosion behaviour of steel at various concentrations of perchloric acid was studied by weight loss method in temperature range from 298 to 323 K. Results obtained show that corrosiveness of acid increases with its concentration and temperature. The logarithm of corrosion rate was plotted against the acid concentration and values of Hammett Ho and
M. Benabdellah, K.F. Khaled, B. Hammouti
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MPEC 2026-C38 : 2026 CT

The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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